package com.kiteqi.wxorder.service.impl;

import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.kiteqi.wxorder.dto.CartDTO;
import com.kiteqi.wxorder.dto.OrderDTO;
import com.kiteqi.wxorder.entity.OrderDetail;
import com.kiteqi.wxorder.entity.OrderMaster;
import com.kiteqi.wxorder.entity.ProductInfo;
import com.kiteqi.wxorder.enums.OrderStatusEnum;
import com.kiteqi.wxorder.enums.PayStatusEnum;
import com.kiteqi.wxorder.enums.ResultEnum;
import com.kiteqi.wxorder.exception.SellException;
import com.kiteqi.wxorder.mapper.OrderDetailMapper;
import com.kiteqi.wxorder.mapper.OrderMasterMapper;
import com.kiteqi.wxorder.service.OrderService;
import com.kiteqi.wxorder.service.ProductService;
import com.kiteqi.wxorder.utils.KeyUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private ProductService productService;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private OrderMasterMapper orderMasterMapper;

    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {
        String orderId = KeyUtil.genUniqueKey();
        BigDecimal orderAmount = new BigDecimal(BigInteger.ZERO);

        List<CartDTO> cartDTOList = new ArrayList<>();

        //1. 查询商品（数量, 价格）
        for (OrderDetail orderDetail: orderDTO.getOrderDetailList()) {
            ProductInfo productInfo =  productService.findOne(orderDetail.getProductId());
            if (productInfo == null) {
                throw new SellException(ResultEnum.PRODUCT_NOT_EXIST);
//                throw new ResponseBankException();
            }

            //2. 计算订单总价
            orderAmount = productInfo.getProductPrice()
                    .multiply(new BigDecimal(orderDetail.getProductQuantity()))
                    .add(orderAmount);

            //订单详情入库
            orderDetail.setDetailId(KeyUtil.genUniqueKey());
            orderDetail.setOrderId(orderId);
            BeanUtils.copyProperties(productInfo, orderDetail);
            orderDetailMapper.insert(orderDetail);

            //组装购物车
            CartDTO cartDTO = new CartDTO(orderDetail.getProductId(), orderDetail.getProductQuantity());
            cartDTOList.add(cartDTO);
        }


        //3. 写入订单数据库（orderMaster和orderDetail）
        OrderMaster orderMaster = new OrderMaster();
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO, orderMaster);
        orderMaster.setOrderAmount(orderAmount);
        orderMaster.setOrderStatus(OrderStatusEnum.NEW.getCode());
        orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode());
        orderMasterMapper.insert(orderMaster);

        //4. 扣库存
//        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream().map(e ->
//                new CartDTO(e.getProductId(), e.getProductQuantity())
//        ).collect(Collectors.toList());
        productService.decreaseStock(cartDTOList);


        return orderDTO;
    }

    @Override
    public OrderDTO findOne(String orderId) {
        OrderMaster orderMaster = orderMasterMapper.selectById(orderId);
        if (orderMaster == null) {
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        }

        List<OrderDetail> orderDetailList = orderDetailMapper.findByOrderId(orderId);
        if (CollectionUtils.isEmpty(orderDetailList)) {
            throw new SellException(ResultEnum.ORDERDETAIL_NOT_EXIST);
        }

        OrderDTO orderDTO = new OrderDTO();
        BeanUtils.copyProperties(orderMaster, orderDTO);
        orderDTO.setOrderDetailList(orderDetailList);

        return orderDTO;
    }

    @Override
    public List<OrderDTO> findList(String buyerOpenid, int pageNumber, int pageSize) {

        Page<OrderMaster> orderMasterPage = orderMasterMapper.selectPage(
                new Page<OrderMaster>(pageNumber, pageSize),
                new QueryWrapper<OrderMaster>().eq("buyer_openid" , buyerOpenid)
        );

        List<OrderDTO> orderDTOList = new ArrayList<>();
        for (OrderMaster orderMaster : orderMasterPage.getRecords()) {
            OrderDTO orderDTO = new OrderDTO();
            BeanUtils.copyProperties(orderMaster, orderDTO);
            orderDTOList.add(orderDTO);
        }

        return orderDTOList;
    }

    @Override
    @Transactional
    public OrderDTO cancel(OrderDTO orderDTO) {
        OrderMaster orderMaster = new OrderMaster();

        //判断订单状态
        if (!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("【取消订单】订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
        BeanUtils.copyProperties(orderDTO, orderMaster);
        int updateResult = orderMasterMapper.updateById(orderMaster);
        if (updateResult == 0) {
            log.error("【取消订单】更新失败, orderMaster={}", orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        //返回库存
        if (CollectionUtils.isEmpty(orderDTO.getOrderDetailList())) {
            log.error("【取消订单】订单中无商品详情, orderDTO={}", orderDTO);
            throw new SellException(ResultEnum.ORDER_DETAIL_EMPTY);
        }
        List<CartDTO> cartDTOList = new ArrayList<>();
        for (OrderDetail detail : orderDTO.getOrderDetailList()) {
            CartDTO cartDTO = new CartDTO(detail.getProductId(), detail.getProductQuantity());
            cartDTOList.add(cartDTO);
        }
        productService.increaseStock(cartDTOList);

        //如果已支付, 需要退款
        //TODO

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO finish(OrderDTO orderDTO) {
        //判断订单状态
        if (!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("【完结订单】订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO, orderMaster);
        int updateResult = orderMasterMapper.updateById(orderMaster);
        if (updateResult == 0) {
            log.error("【完结订单】更新失败, orderMaster={}", orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        //推送微信模版消息
        //TODO

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO paid(OrderDTO orderDTO) {
        //判断订单状态
        if (!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("【订单支付完成】订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //判断支付状态
        if (!orderDTO.getPayStatus().equals(PayStatusEnum.WAIT.getCode())) {
            log.error("【订单支付完成】订单支付状态不正确, orderDTO={}", orderDTO);
            throw new SellException(ResultEnum.ORDER_PAY_STATUS_ERROR);
        }

        //修改支付状态
        orderDTO.setPayStatus(PayStatusEnum.SUCCESS.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO, orderMaster);
        int updateResult = orderMasterMapper.updateById(orderMaster);
        if (updateResult == 0) {
            log.error("【订单支付完成】更新失败, orderMaster={}", orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        return orderDTO;
    }

    @Override
    public List<OrderDTO> findList(int pageNumber, int pageSize) {
        List<OrderMaster> orderMasterList = orderMasterMapper.selectList(
                null
        );

        List<OrderDTO> orderDTOList = new ArrayList<>();
        for (OrderMaster orderMaster : orderMasterList) {
            OrderDTO orderDTO = new OrderDTO();
            BeanUtils.copyProperties(orderMaster, orderDTO);
            orderDTOList.add(orderDTO);
        }

        return orderDTOList;
    }
}
